CBSE Class 11 Chapter 3 Classification of elements and periodicity in Properties
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NCERT SOLUTIONS Class 9 Chapter 2
Question 1. What is meant by a substance? Answer: A substance made up of a single type of particle is known as a pure substance. Question 2. List the points of differences between homogeneous and heterogeneous mixtures. Answer: S. No. Homogeneous Heterogeneous 2 It has a uniform composition. Its composition is non- uniform. 3 It
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NCERT SOLUTIONS Class 9 Chapter 1
Question 1: Convert the following temperatures to the Celsius scale. (a) 300 K (b) 573 K Answer: Using the formula: – T (°C) = T (K) – 273.15 300K = (300 – 273) = 27O C 573 K = (573 – 273) = 300O Cnaphthalene Question 2: Convert the following temperatures to the Kelvin
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IMPORTANT QUESTIONS CLASS 9 Chapter 2
Very Short and Short Answer Type Questions What are colloids? Give examples. What are emulsions? Give examples. What are sols? Give examples. Define Aqueous and non-aqueous solutions. Give an example of liquid in a liquid solution. Write down the properties of compounds. What is a saturated solution? Give examples. If 50 ml of acetone is
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IMPORTANT QUESTIONS CLASS 9 Chapter 1
Very short and Short Answer Type Questions How can we separate a mixture of two liquids? Name the process to separate the particles of the colloid. How do we test the purity of substances? Gases can be easily compressed but not liquids. Why? Which gas is called dry ice? Why? Differentiate between the three states
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Important Questions Class 8 Chapter 14
Short answer type questions Question 1. What do you understand by the good and bad conductors of electricity? List some examples of each Question 2. List the names of some liquids that conduct electricity. Question 3. Why the water from taps is considered a good conductor of electricity? Question 4. What are the chemical
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Important Questions Class 8 Chapter 5
Short answer type questions Question 1. Name four natural resources. Question 2. Write the difference between inexhaustible and exhaustible natural resources Question 3. Write the uses of coal. Name some products of coal. Question 4. What are fossil fuels? Question 5. Which gas is produced by the burning of coal? Question 6. What is
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Important Questions Class 8 Chapter 15
Short answer type questions Question 1. What is lightning? How does it affect us? Question 2. What do understand by a charged object? How will you find if the object is charged or not? Question 3. Explain with an example that charges of the same kind repel each other. Question 4. What is an
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